Jordan, over here at Udacity we currently use a combo of both invision for flows and zeplin spec. I do know invision is introducing the spec and asset exporting soon which will be great to be purely using one tool. We also have a sketch ui kit that is imported into zeplin for the larger or to reference. Obviously, I glossed over the details here, but hopefully gives you an idea of one of the stages.

Hightail has officially launched a new creative collaboration tool called Hightail Spaces. It’s a uniquely visual approach to sharing files, collecting feedback and managing versions. It’s free to use and we’re in beta, so we’d love to know what you think.